Mendel took the pollen from a tall pea plant and pollinated the flower of a short pea plant. when he did this, he removed the male parts of the flower on the short plant. why was it important that he remove the male parts from the flower of the short plant?

To avoid self-pollination

Explanation:

Most types of flowers are monoecious in nature meaning they contain both the staminate and pistillate flowers. Mendel wanted to prove that that there are laws that govern inheritance and that characteristics of an organism are determined by hereditary factors which occur in pair.

He remove the male parts of the flower to avoid self pollination of the short flowers since he intended to obtain pure breeds of the plant.